This article is from the Baby Proofing FAQ, by Sandra Smith, email@example.com with numerous contributions by others.
From: firstname.lastname@example.org (Mike Fields)
What we did for our hearth that has worked out very well was to get some of
those steel angle sheet rock corners (light wt. steel angle iron equiv about
1-1/4 X 1-1/4 inches) and glue polyfoam pipe insulation with a 90 degree
wedge cut out of it to the angle. We then screwed the angle to the hearth
after drilling small holes with a masonary bit. Works great! and the
advantage of using the steel angle instead of gluing directly to the hearth
is that when the kids get older etc, it is easy to remove, leaving only the
small mounting holes. Of course, you have to watch for them trying to eat
the stuff when they are teething (as well as anything else they can wrap
their gums around!!) We also used the foam insulation on the aquarium
stand that I welded up (80 gallon tank ) for the front room. The
pipe insulation comes in 6 foot lengths (I think) and is only a couple
of dollars per length. It is avail in a number of sizes, although the
most common one seems to be for 1/2 or 3/4 inch pipe. This has an outside
diameter of about 2 inches. It is available in off-white, brown, gray
and perhaps some other colors.
hope that saves someone's head/teeth!!